KUALA LUMPUR: A lack of consistency continues to trouble national shuttlers as seen from their disappointing outing at the Glasgow World Championships.

With the exception of Lee Chong Wei's defeat, which can be seen as a special case, the rest of the senior players competing in Scotland struggled with erratic performances.

Olympic silver medalists Goh V Shem-Tan Wee Kiong, who have been struggling for form this season, went down tamely to South Koreans Chung Eui Seok-Kim Dukyong (21-18, 21-16) in the second round of the men's doubles.

To be fair, it was the pair's first game in two months having been given a bye for the first round and it was hard for them to hit the ground running.

However, the duo should have found a way through given the vast experience they have competing at the world level. The performance does raise question marks on whether there are cracks in their on-court relationship.

Zulfadli Zulkiffli failed to better his performance in 2015 when he reached the third round as he was shown the exit by Thailand's Tanongsak Saensomboonsuk in the second round.

Low Juan Shen-Chooi Kah Ming will need to work on the experience they gained at the world meet where they lost to second-seeds Mathias Boe-Carsten Mogensen in the second round.

The mixed doubles saw Tan Kian Meng-Lai Pei Jing doing reasonably well to reach the third round. It was Kian Meng's debut at the World Championships and the pair still have a lot of room for improvement.